Improvement in xself-sharpening p plows



JL W. POST.

Plow.

Patented Oct. 8, 1838. V

UNITED STATES PATENT OFFICE.

JOHN W. POST, OF BALTIMORE, MABYLAND.

IMPROVEMENT IN `SELF-SHARPEN|NG PLOWS.

Specificaton forning part of Letters Patent No. 970, dated October 8,1838.

To all whom it may concern: V Be it known that I, JOHN WV. POST, ofBaltimore, Maryland, have nvented a new and useful Improvement on Plows;and I do hereby declare that the following' is a full and exactdescription.

It has generall y been supposed that the plow has already assumed everypossible forn that can add to the value of this indispensible implement,but it is also admitted that any imbeing alike on both sides. a a arepresent a fiat surfaee. From (t to b b b represent a regular taper,leaving a rounded ridge from a to each point,0r the ridge may form anangle,as represented at a, Fig. 2, or a a, Fig. 3. The center, at c,Fig. 1, is a countersink, with' a hole in the middle, having slotsextending toward each point ot' the share, as will be nore particularlydcscrihed hereinafter.

Fig. 3 represents the position of the share as attached to the noldboard and landside.

Fig. 4 represents an inner section ot' the landsidewith theshare-edgelodged in a groove, the groove passing* obliquely through, soas to let the shareedge appear on thcouter surface of the landside, asat (1, Fig. 3. d d, Fig. 5, also show the groove in the Iandside.

f, Fig.3,is the bolt-head eountersunk on the upper side of themold-board. The bolt passes through the center of the share, has ascrewon the end, and a nnt holds the share in place.

I have now described the share as simply secured to the mold-board andlandside; but by means of the branched hole or slots, as seen at Figs. 4or 6, the edge of the share (when the edge that requires to be placednext to the i Fig. 7 represents a full-size countersink in the share.The dotted center, as at a. is the end of the screw under the share. Thecircle b is a washer. c c is the nut, and d d d are the slots extendingoutward from the center, as at d d d, Fig. 6. It will be perceived thatby means of the slots the position of the sharein relation to the bolt,landside, and moldboard may be altrred. e e is a block of wood or metal,which may be fitted into the slot, and will be kept in place by thewasler and prevent the share from reacting from the bolt in anydirection required. The block Will be longer or shorter to suit theposition of the share.

Fig. S rcpresents the share as having one edge and two points, the sidesa ar being blunt or square. Fig. 9 has the end b cut'- off. Figs. 10 and11 represent the position of the share in the landside, the back end ofthe share a, next to the landside,coning flush through and notdiag'onally, or mostly inside, as the threeedged share does in Figs. 3and 4. This form of the share has a slot-hole, as seen at Figs. S and 9,to bring it flush with the landside when the side t-o be presented nextto the landside is worn otf. From its susceptihility of being turnedover and havingtwo points,it becomes a self-sharpener. 'The form withthree edges is susceptible of a nuch greater number of changes.

Thepeculiar manner of uniting or combining the share with the mold-boardand landside, and the niannerof regulating thepositio 'of the sharebymeans of the slot or slots in the share, all as represcnted in thedifferent figures in the drawings.

JOHN W; POST; Witnesses:

OBED HUSSEY,

RroHD. B. GH NOWETH, Jr.

